AN2606 datasheet(19/155 Pages) STMICROELECTRONICS

tên linh kiện	AN2606

Giải thích chi tiết về linh kiện	STM32 microcontroller system memory boot mode

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DocID13801 Rev 21

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AN2606

General bootloader description

154

3.3

Hardware connection requirements

To use the USART bootloader, the host has to be connected to the (RX) and (TX) pins of the

desired USARTx interface via a serial cable.

Figure 1. USART Connection

1. A Pull-UP resistor should be added, if pull-up resistor are not connected in host side.

2. An RS232 transceiver must be connected to adapt voltage level (3.3V - 12V) between STM32 device and

host.

Note:

+V typically 3.3 V and R value typically 100KOhm.This value depend on the application and

the used hardware.

To use the DFU, connect the microcontroller's USB interface to a USB host (i.e. PC).

Figure 2. USB Connection

1. This additional circuit permits to connect a Pull-Up resistor to (DP) pin using VBus when needed. Refer to

product section (Table which describes STM32 Configuration in system memory boot mode) to know if an

external pull-up resistor must be connected to (DP) pin.

Note:

+V typically 3.3 V.This value depends on the application and the used hardware.

AN2606 bảng dữ liệu(PDF) 19 Page - STMicroelectronics